Display screen or portion thereof with a graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with agraphical user interface showing our new design according to a firstembodiment.

FIG. 2 is another front view thereof according to a second embodiment.

FIG. 3 is another front view thereof according to a third embodiment;and,

FIG. 4 is another front view thereof according to a fourth embodiment.

Shaded portions indicate a contrast in appearance. The outermost brokenlines in the figures show a display screen or portion thereof and formno part of the claimed design. The even dashed ellipse around the headicon shows portions of the graphical user interface that form no part ofthe claimed design. The text shown in dashed broken lines(s) define thebounds of the claimed design and form no part thereof.

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 